On 8/22/2010 12:39 PM, Tapas Mishra wrote:
He he tried what you said.
I wont 2 cents :)
It did not worked
Ok. So you included linux/syscalls.h instead of sys/syscalls.h
and still it cannot find "__NR_exit" symbol. Right? Or it
compiled successfully but did not load.
--snip--
sys/syscall.h: No such file or directory
/home/tapas/LKP/pandora/temp/sample2/sample2.c: In function ‘init_module’:
/home/tapas/LKP/pandora/temp/sample2/sample2.c:14: error: ‘__NR_exit’
undeclared (first use in this function)
--snip--
From your previous errors, sys/syscall.h is not there.
I'll second Mulyadi you have to use linux/syscalls.h or unistd.h
or different header file which defines __NR_exit. And this
part is only for unresolved symbol.
Following is new program
#include<linux/kernel.h>
#include<sys/syscalls.h>
#include<linux/module.h>
extern void *sys_table[];
asmlinkage int(*main_sys_exit)(int);
asmlinkage int alt_exit_function(int err_code)
{
printk("Sys_exit called with err_code=%d\n",err_code);
return main_sys_exit(err_code);
}
int init_module()
{
main_sys_exit=sys_table[__NR_exit];
sys_table[__NR_exit]=alt_exit_function;
}
void cleanup_module()
{
sys_table[__NR_exit]=main_sys_exit;
}
Following is way I compiled
gcc -I /usr/include/ -Wall -DMODULE -D__KERNEL__ -DLINUX -c sample2.c
and following are the errors
http://pastebin.com/u3mPhfUf
Then I compiled it also in following way
gcc -I /usr/src/linux-headers-2.6.28-11-generic/include/linux/ -Wall
-DMODULE -D__KERNEL__ -DLINUX -c sample2.c
and got following errors
http://pastebin.com/HzX0DBz1
.
So 2 cents :)
any how this is the original link where I was trying the code
page 48 left hand column
https://docs.google.com/fileview?id=0B2A4urYOAf6POTI1OGE1MjctM2UyMC00OGUzLThlNDUtZDBhOWFjY2Y1MDUz&hl=en
Any more suggestions.
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